As The RISC-V PLIC can not apply affinity setting without calling
irq_enable(), it will make the interrupt unavaible when using as
an underlying irq chip for MSI controller.
Introduce the irq_startup/irq_shutdown for PCI domain template with
new MSI domain flag. This allow the PLIC can be properly configurated
when calling irq_startup().
Suggested-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Inochi Amaoto <inochiama@xxxxxxxxx>
---
drivers/pci/msi/irqdomain.c | 52 +++++++++++++++++++++++++++++++++++++
include/linux/msi.h | 2 ++
2 files changed, 54 insertions(+)
diff --git a/drivers/pci/msi/irqdomain.c b/drivers/pci/msi/irqdomain.c
index 0938ef7ebabf..f0d18cadbe20 100644
--- a/drivers/pci/msi/irqdomain.c
+++ b/drivers/pci/msi/irqdomain.c
@@ -148,6 +148,23 @@ static void pci_device_domain_set_desc(msi_alloc_info_t *arg, struct msi_desc *d
arg->hwirq = desc->msi_index;
}
+static __always_inline void cond_shutdown_parent(struct irq_data *data)
+{
+ struct msi_domain_info *info = data->domain->host_data;
+
+ if (unlikely(info->flags & MSI_FLAG_PCI_MSI_STARTUP_PARENT))
+ irq_chip_shutdown_parent(data);
+}
+
+static __always_inline unsigned int cond_startup_parent(struct irq_data *data)
+{
+ struct msi_domain_info *info = data->domain->host_data;
+
+ if (unlikely(info->flags & MSI_FLAG_PCI_MSI_STARTUP_PARENT))
+ return irq_chip_startup_parent(data);
+ return 0;
+}
+
static __always_inline void cond_mask_parent(struct irq_data *data)
{
struct msi_domain_info *info = data->domain->host_data;
@@ -164,6 +181,23 @@ static __always_inline void cond_unmask_parent(struct irq_data *data)
irq_chip_unmask_parent(data);
}
+static void pci_irq_shutdown_msi(struct irq_data *data)
+{
+ struct msi_desc *desc = irq_data_get_msi_desc(data);
+
+ pci_msi_mask(desc, BIT(data->irq - desc->irq));
+ cond_shutdown_parent(data);
+}
+
+static unsigned int pci_irq_startup_msi(struct irq_data *data)
+{
+ struct msi_desc *desc = irq_data_get_msi_desc(data);
+ unsigned int ret = cond_startup_parent(data);
+
+ pci_msi_unmask(desc, BIT(data->irq - desc->irq));
+ return ret;
+}
+
static void pci_irq_mask_msi(struct irq_data *data)
{
struct msi_desc *desc = irq_data_get_msi_desc(data);
@@ -194,6 +228,8 @@ static void pci_irq_unmask_msi(struct irq_data *data)
static const struct msi_domain_template pci_msi_template = {
.chip = {
.name = "PCI-MSI",
+ .irq_startup = pci_irq_startup_msi,
+ .irq_shutdown = pci_irq_shutdown_msi,
.irq_mask = pci_irq_mask_msi,
.irq_unmask = pci_irq_unmask_msi,
.irq_write_msi_msg = pci_msi_domain_write_msg,
@@ -210,6 +246,20 @@ static const struct msi_domain_template pci_msi_template = {
},
};
+static void pci_irq_shutdown_msix(struct irq_data *data)
+{
+ pci_msix_mask(irq_data_get_msi_desc(data));
+ cond_shutdown_parent(data);
+}
+
+static unsigned int pci_irq_startup_msix(struct irq_data *data)
+{
+ unsigned int ret = cond_startup_parent(data);
+
+ pci_msix_unmask(irq_data_get_msi_desc(data));
+ return ret;
+}
+
static void pci_irq_mask_msix(struct irq_data *data)
{
pci_msix_mask(irq_data_get_msi_desc(data));
@@ -234,6 +284,8 @@ EXPORT_SYMBOL_GPL(pci_msix_prepare_desc);
static const struct msi_domain_template pci_msix_template = {
.chip = {
.name = "PCI-MSIX",
+ .irq_startup = pci_irq_startup_msix,
+ .irq_shutdown = pci_irq_shutdown_msix,
.irq_mask = pci_irq_mask_msix,
.irq_unmask = pci_irq_unmask_msix,
.irq_write_msi_msg = pci_msi_domain_write_msg,
diff --git a/include/linux/msi.h b/include/linux/msi.h
index e5e86a8529fb..3111ba95fbde 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -568,6 +568,8 @@ enum {
MSI_FLAG_PARENT_PM_DEV = (1 << 8),
/* Support for parent mask/unmask */
MSI_FLAG_PCI_MSI_MASK_PARENT = (1 << 9),
+ /* Support for parent startup/shutdown */
+ MSI_FLAG_PCI_MSI_STARTUP_PARENT = (1 << 10),
/* Mask for the generic functionality */
MSI_GENERIC_FLAGS_MASK = GENMASK(15, 0),
--
2.50.1
